Cannot render video in video editor
I, too, am somewhat new to Blender, and this one has gotten me several times.  If I'm guessing correctly, the problem lies in the order in which sources for rendering are processed.  In the picture below, I show that the render output panel is selected in the properties window (upper left highlight).


Way down at the bottom of that panel is a flippy triangle marked Post Processing.  I think rendering first looks for something in the Compositing timeline if the Compositing box is checked.  Then it looks for something in the Sequencer (video editing) window if the Sequencer box is checked.  If not checked or nothing there, it renders the viewport camera that's active directly.
So, uncheck the Compositor box, check the Sequencer box and let me know whether this now works.
HTH